NSURLSession和身份验证凭证

Question

我想从需要使用NSURLSession进行身份验证的Web服务器获取数据。我尝试了几种不同的方式，没有运气。这是我到目前为止。它正在采用协议方法didReceiveChallenge，但似乎没有进行身份验证。我收到的数据为空。

我检查了用户名/密码，他们是正确的。而且我通过在Safari中转到该URL并手动输入凭据并查看JSON，再次检查了URL是否正确。

@interface PlaylistData1b() <NSURLSessionDataDelegate, NSURLSessionDelegate> 
@property (nonatomic,strong) NSURLSession *session; 
@property (nonatomic, strong) NSString *requestString; 
@end 

@implementation PlaylistData1b 

- (instancetype)initWithURL:(NSString *)urlString 
{ 
    self = [super init]; 
    if(self){ 
     _requestString = urlString; 
    } 
    return self; 
} 
-(void)log 
{ 
    NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration]; 
    _session = [NSURLSession sessionWithConfiguration:config 
              delegate:self 
             delegateQueue:nil]; 
    [self fetchData]; 
} 

-(void)fetchData 
{ 
    NSString *requestString = _requestString; 
    NSURL *url = [NSURL URLWithString:requestString]; 
    NSURLRequest *req = [NSURLRequest requestWithURL:url]; 

    NSURLSessionDataTask *dataTask = 
     [self.session dataTaskWithRequest:req completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) { 

      NSDictionary *jsonObject = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil]; 
      NSLog(@"JSON: %@", jsonObject); 
     }]; 

    [dataTask resume]; 
} 

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler 
{ 
    NSURLCredential *cred = [NSURLCredential credentialWithUser:username 
                 password:password 
                persistence:NSURLCredentialPersistenceNone]; 
    [[challenge sender] useCredential:cred forAuthenticationChallenge:challenge]; 
    completionHandler(NSURLSessionAuthChallengeUseCredential, cred); 
    NSLog(@"Finished Challenge"); 
} 

这里是我的输出。

2015-10-12 15:03:57.322 GetPlaylistData[7040:138551] Finished Challenge 
2015-10-12 15:04:33.321 GetPlaylistData[7040:138788] JSON: (null) 

任何帮助表示赞赏。谢谢。

Answer 1

我可能会尝试修改didReceiveChallenge喜欢的东西下面

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler 
{ 
    NSString *authMethod = [[challenge protectionSpace] authenticationMethod]; 

    if ([authMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) { 

     NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]; 
     completionHandler(NSURLSessionAuthChallengeUseCredential,credential); 
    } else { 
     NSURLCredential *cred = [NSURLCredential credentialWithUser:username 
                  password:password 
                 persistence:NSURLCredentialPersistenceNone]; 
     [[challenge sender] useCredential:cred forAuthenticationChallenge:challenge]; 
     completionHandler(NSURLSessionAuthChallengeUseCredential, cred); 
     NSLog(@"Finished Challenge"); 
    } 
}